so at the 180HP+ mark the 20v is still superior vs a 16v small/bigport combo? in terms of power/torque/range/reliability??
Considering 180hp isnt a huge ask of a 20v I would say yes. If you were to say 250hp then it would be a very hard point to prove. End of the day it comes down to development. And from what I have seen, far too many people are too quick to build tough bottom ends, before looking at what actually matters, its why we see soo many 90kw 7as and so few 100kw 4as.
the reason i ask is because that's my target for my planned 16v build. Seems i have a lot of other questions to ask as well as a lot of rethinking.. 180HP from the 16v i'm looking at 288 deg. 8.5 lift cams and adj cam gears, shaved and ported head, hi comp pistons, ITB setup, ecu and then all the other bits in between like balancing, bore cyl., valve springs or any other valve train replacements if needed etc etc.. Most of which i would assume is needed for a decent 16v rebuild... and already that is looking to be around the 5k mark and is a decent amount of work and effort... in all honesty I've never assessed how this kind of build would stack up vs a 20v
Last edited by JDM-086; 6th August 2012 at 04:43 PM.
Well take beaus/magicmans engine into consideration, that had all the time/money spent on the head, extractors, and 50mm throttles, it made close to that power, it did need some more oil, a bit more pressure probably would of helped. Also that engine was only going to 8000rpm from memory, so you can see the potential.
not familiar with his motor..20v ?
PS. how would you up the oil pressure? don't they already have the newer design oil pumps in them? change the spring in the oil pump?
Yep
The issue i have with 20Vs, especially silvertops, is that they are getting old, and prone to the VVT actuator failing - which is not a cheap part to replace (~$500 iirc).
Personally i love the smallport. They are cheap, simple, cheerful, reliable, and quick.
My old AE71 had a smallport which i found in a bin at an import wreckers, bought for $100, slapped it in without ANY rebuild.... and it ran 15.7 1/4 mile.
Only mods were cut n shut intake manifold, 4-1 kaizen garage extractors, and 2" exhaust....
... and pmpness.
KE70 Turbo 18R-G - Project Skid Car
As above, smallports are pretty damn good, especially in bog stock form. 16v are just easier to get in and running, not to bag the 20v but there is a bit of fucking around.
My 16v ae85 trueno back home in ireland has
- standard bore high compression pistons
- smallport head (skimmed more than once)
- 1.6mm headgasket to keep compression down and make sure the piston crown was ok
- toda 288/304 degree 8.5mm lift camshafts
- 20v silvertop throttle bodies
- 315cc pink 3sge injectors
- arp goodies
- big blue trumpets
- omex 600 standalone ecu
Engine was built over 2years ago. Was on mikuni carbs for about a year and a half then changed to the itb setup.
Was used on road and track. Has been thrashed a lotRevving to 8800rpm on carbs & 8650rpm on itbs without any issues.
Engine made 202bhp and 145lbft torque at the flywheel
16v =
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